#!/usr/bin/env node 
var pi=Math.PI;
var circle=function(r){
  function circumference(){
    return pi*2*r;
  };
  function area(){
    return pi*r*r;
  }
  return{
    area:area,
    circumference:circumference 
  };
}
console.log('\n03-export-function.js:\n',module);
module.export=circle;
